Heat transfer is a strange world. The coolant has to travel fast enough so
it doesn't boil at the point of pickup (block/head in this case). It also
has to travel slow enough to transfer heat to the radiator. The following
URL will give a crude idea of what I'm talking about.
http://home.texoma.net/~sitsinwest/temp/flow.jpg
Liquid travels fastest in the center of a pipe slowing as it approaches the
wall of the pipe. It is possible to push the coolant through the center of
the tube at a fast rate not giving it sufficient time to transfer the heat.
This happens if the radiator is too small or the flow rate is too high.
More tubes in a radiator will slow the coolant speed through each tube
allowing more time to dump the heat. It is a balancing act that can get
rather tricky to make work.
If you are certain that you have proper flow rate for the engine, the only
alternative is a larger radiator.
Best regards,
Fred Schroeder
Denison, TX
SRL311-13359
TDROC
Reg e-mail sitsinwest@texoma.net
Home page http://home.texoma.net/~sitsinwest
----- Original Message -----
From: "Leonard Sprague" <sprague@ufl.edu>
To: <datsun-roadsters@autox.team.net>
Sent: Monday, April 21, 2003 7:05 PM
Subject: RE: Aluminum Radiators
> List,
>
> I'd like to thank Sid Raper, Brad Holms, Ian Miller, Andy Cost, Don
Miller,
> Milton, Craig Halsted, Greg Burrows, Michael Spreadbury, & Bill Hatfield
for
> replying to my inquiry about the radiator replacement. Thanks guys.
>
> I decided to replace the radiator for the VG30 engine with a 53mm thick -
2
> row - Koyo high-performance racing aluminum radiator.
>
> http://www.absoluteradiator.com/ProductPage.asp?idProd=11
>
> (it's the one on the top)
>
> I opted for this one because it was larger than the Fluidyne, which is
38mm
> thick.
>
> Guess what? It still gets hot!
>
> http://rabbit.circa.ufl.edu/gallery/vg30/DSC04793
> http://rabbit.circa.ufl.edu/gallery/vg30/DSC04795
> http://rabbit.circa.ufl.edu/gallery/vg30/DSC04797
>
> Anyone have any ideas?
>
> Currently, I running the 300z's water pump, the Koyo radiator, and an
> electric fan. I'm wondering if the anti-freeze (or water) is running
through
> the radiator too fast to properly cool it. Would an electric pump work
> better to slow the flow down? Or is there something else I can try? I'm
> running out of time before Road Atlanta. Hopefully, I can figure out a
> solution.
>
> Thanks in advance for any ideas or help. I really appreciate it!
>
> -Lenny Sprague
> Gainesville, FL
>
> '69 SPL311/VG30
> http://rabbit.circa.ufl.edu/gallery/roadster
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